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Ford 9N, 2N & 8N Discussion Forum
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Electrical problems!

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Alvin Roberts (

04-12-2006 19:23:32




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I drove my 8N over to a friend"s to show him a few days ago and my tractor went dead. I left it at an idle as I spoke with him for about 5-10 minutes before it just died. It would not start back up and I figured out it had no spark. Upon further examination, the spring on the bottom of the coil was burned off! It"s a 1948 model, front mount distributor. Some background on the tractor: the alternator doesn"t work. It"s been converted to 12V system and it was a new 12V coil on the tractor. I had it running every day almost for a couple of weeks before this happened. I did not have a resistor in series going to the coil. Anyone have any ideas or suggestions? I managed to make the spring, or what was left of it, contact the screw head on the distributor and still no fire...the coil may be bad altogether now. Voltage is passing through the coil to the points because it will light a test light but I didn"t check how much voltage. Thanks for your help....

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Alvin Roberts (MS)

04-13-2006 03:15:31




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 Re: Electrical problems! in reply to Alvin Roberts (MS), 04-12-2006 19:23:32  
Thanks for the replies. I guess I'll order another coil and this time leave the resistor in. By the way, I checked that voltage at the points with the distributor cap removed for access.



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Bob

04-12-2006 19:50:21




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 Re: Electrical problems! in reply to Alvin Roberts (MS), 04-12-2006 19:23:32  
"N" series guru Dell preaches using a 1/2 Ohm, 20 Watt resistor ahead of even the "so called" 12-Volt coils to limit primary ignition circuit current to a safe level, and you've just found out why this is good advice.

Most likely, your coil shorted out when it was good and warmed up after your tractor ride, and burned the coiled "spring thingy" off.

Sometimes, the coils "recover" after they cool, sometimes not. The points may be burned, too.

Where are you checking for power with your test light, at the coil's top terminal, or down at the special screw the "spring thingy" contacts (with the distributor cap removed for access)?

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K.LaRue-VA

04-12-2006 19:48:55




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 Re: Electrical problems! in reply to Alvin Roberts (MS), 04-12-2006 19:23:32  
Most likely burned up the coil. Even a 12-volt coil needs one of those automotive type voltage dropping ballast resistors in the circuit to survive. BTDT, I used the same logic and bought a 12-volt coil so I wouldnt have to track down the correct resistor. After I burned up my new 12-volt coil I put the old 6-volt coil back on and went looking for the correct resistor. Its been working great ever since.

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old

04-12-2006 19:41:21




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 Re: Electrical problems! in reply to Alvin Roberts (MS), 04-12-2006 19:23:32  
My guess would be you have a 6 volt coil in a 12 volt box, or just plain a bad coil. I would replce the coil and see what happens. Sorry to say parts aren't like they where 40 years ago and some times what the box says isn't what you get



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